Что означает warning при обновлении CentOS?

Установил CentOS.
При обновлении yum update в потоке появляется такая портянка.
Скажите что это значит и насколько это критично при использовании?

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Cleanup : nss-softokn-freebl-3.16.2.3-9.el7.x86_64 535/538
Cleanup : glibc-2.17-78.el7.x86_64 536/538
Cleanup : tzdata-2015a-1.el7.noarch 537/538
Cleanup : libgcc-4.8.3-9.el7.x86_64 538/538
2671 blocks
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depmod: WARNING: /lib/modules/3.10.0-514.10.2.el7.x86_64/weak-updates/vboxsf.ko needs unknown symbol VBoxGuest_RTSemFastMutexRelease
depmod: WARNING: /lib/modules/3.10.0-514.10.2.el7.x86_64/weak-updates/vboxsf.ko needs unknown symbol VBoxGuest_RTErrConvertToErrno
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depmod: WARNING: /lib/modules/3.10.0-514.10.2.el7.x86_64/weak-updates/vboxsf.ko needs unknown symbol VBoxGuest_RTLogRelDefaultInstance
depmod: WARNING: /lib/modules/3.10.0-514.10.2.el7.x86_64/weak-updates/vboxsf.ko needs unknown symbol VBoxGuest_RTMemContFree
depmod: WARNING: /lib/modules/3.10.0-514.10.2.el7.x86_64/weak-updates/vboxsf.ko needs unknown symbol VBoxGuest_RTSemMutexRelease
depmod: WARNING: /lib/modules/3.10.0-514.10.2.el7.x86_64/weak-updates/vboxsf.ko needs unknown symbol VBoxGuestIDCOpen
depmod: WARNING: /lib/modules/3.10.0-514.10.2.el7.x86_64/weak-updates/vboxsf.ko needs unknown symbol VBoxGuest_RTAssertShouldPanic
depmod: WARNING: /lib/modules/3.10.0-514.10.2.el7.x86_64/weak-updates/vboxsf.ko needs unknown symbol VBoxGuest_RTLogLoggerEx
depmod: WARNING: /lib/modules/3.10.0-514.10.2.el7.x86_64/weak-updates/vboxsf.ko needs unknown symbol VBoxGuest_RTMemContAlloc
depmod: WARNING: /lib/modules/3.10.0-514.10.2.el7.x86_64/weak-updates/vboxsf.ko needs unknown symbol VBoxGuest_RTSemMutexRequest
depmod: WARNING: /lib/modules/3.10.0-514.10.2.el7.x86_64/weak-updates/vboxsf.ko needs unknown symbol VBoxGuest_RTSemMutexCreate
depmod: WARNING: /lib/modules/3.10.0-514.10.2.el7.x86_64/weak-updates/vboxsf.ko needs unknown symbol VBoxGuest_RTMemTmpAllocTag
depmod: WARNING: /lib/modules/3.10.0-514.10.2.el7.x86_64/weak-updates/vboxsf.ko needs unknown symbol VBoxGuest_RTSemMutexDestroy
depmod: WARNING: /lib/modules/3.10.0-514.10.2.el7.x86_64/weak-updates/vboxsf.ko needs unknown symbol VBoxGuest_RTAssertMsg1Weak
depmod: WARNING: /lib/modules/3.10.0-514.10.2.el7.x86_64/weak-updates/vboxsf.ko needs unknown symbol VBoxGuestIDCClose
depmod: WARNING: /lib/modules/3.10.0-514.10.2.el7.x86_64/weak-updates/vboxsf.ko needs unknown symbol VBoxGuest_RTAssertMsg2Weak
depmod: WARNING: /lib/modules/3.10.0-514.10.2.el7.x86_64/weak-updates/vboxsf.ko needs unknown symbol VBoxGuest_RTMemTmpFree
depmod: WARNING: /lib/modules/3.10.0-514.10.2.el7.x86_64/weak-updates/vboxsf.ko needs unknown symbol VBoxGuestIDCCall
depmod: WARNING: /lib/modules/3.10.0-514.10.2.el7.x86_64/weak-updates/vboxsf.ko needs unknown symbol VBoxGuest_RTSemFastMutexRequest
depmod: WARNING: /lib/modules/3.10.0-514.10.2.el7.x86_64/weak-updates/vboxsf.ko needs unknown symbol VBoxGuest_RTSemFastMutexRelease
depmod: WARNING: /lib/modules/3.10.0-514.10.2.el7.x86_64/weak-updates/vboxsf.ko needs unknown symbol VBoxGuest_RTErrConvertToErrno
depmod: WARNING: /lib/modules/3.10.0-514.10.2.el7.x86_64/weak-updates/vboxsf.ko needs unknown symbol VBoxGuest_RTSemFastMutexCreate
depmod: WARNING: /lib/modules/3.10.0-514.10.2.el7.x86_64/weak-updates/vboxsf.ko needs unknown symbol VBoxGuest_RTSemFastMutexDestroy
depmod: WARNING: /lib/modules/3.10.0-514.10.2.el7.x86_64/weak-updates/vboxsf.ko needs unknown symbol VBoxGuest_RTLogRelDefaultInstance
depmod: WARNING: /lib/modules/3.10.0-514.10.2.el7.x86_64/weak-updates/vboxsf.ko needs unknown symbol VBoxGuest_RTMemContFree
depmod: WARNING: /lib/modules/3.10.0-514.10.2.el7.x86_64/weak-updates/vboxsf.ko needs unknown symbol VBoxGuest_RTSemMutexRelease
depmod: WARNING: /lib/modules/3.10.0-514.10.2.el7.x86_64/weak-updates/vboxsf.ko needs unknown symbol VBoxGuestIDCOpen
depmod: WARNING: /lib/modules/3.10.0-514.10.2.el7.x86_64/weak-updates/vboxsf.ko needs unknown symbol VBoxGuest_RTAssertShouldPanic
depmod: WARNING: /lib/modules/3.10.0-514.10.2.el7.x86_64/weak-updates/vboxsf.ko needs unknown symbol VBoxGuest_RTLogLoggerEx
depmod: WARNING: /lib/modules/3.10.0-514.10.2.el7.x86_64/weak-updates/vboxsf.ko needs unknown symbol VBoxGuest_RTMemContAlloc
depmod: WARNING: /lib/modules/3.10.0-514.10.2.el7.x86_64/weak-updates/vboxsf.ko needs unknown symbol VBoxGuest_RTSemMutexRequest
depmod: WARNING: /lib/modules/3.10.0-514.10.2.el7.x86_64/weak-updates/vboxsf.ko needs unknown symbol VBoxGuest_RTSemMutexCreate
depmod: WARNING: /lib/modules/3.10.0-514.10.2.el7.x86_64/weak-updates/vboxsf.ko needs unknown symbol VBoxGuest_RTMemTmpAllocTag
depmod: WARNING: /lib/modules/3.10.0-514.10.2.el7.x86_64/weak-updates/vboxsf.ko needs unknown symbol VBoxGuest_RTSemMutexDestroy
depmod: WARNING: /lib/modules/3.10.0-514.10.2.el7.x86_64/weak-updates/vboxsf.ko needs unknown symbol VBoxGuest_RTAssertMsg1Weak
depmod: WARNING: /lib/modules/3.10.0-514.10.2.el7.x86_64/weak-updates/vboxsf.ko needs unknown symbol VBoxGuestIDCClose
depmod: WARNING: /lib/modules/3.10.0-514.10.2.el7.x86_64/weak-updates/vboxsf.ko needs unknown symbol VBoxGuest_RTAssertMsg2Weak
Verifying : 3:irqbalance-1.0.7-6.el7.x86_64 1/538
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